#include <stdio.h>

// test the DEBUG
//build:gcc -o test -g -DDEBUG test.c
//It will print "test debug"
// else not include -DDEBUG, it will only print "hello,world!"
int main()
{
	printf("hello,world!\n");
#ifdef DEBUG
	printf("test debug\n");
#endif
	return 0;
}

